<?php if (!defined('BASEPATH')) exit('No direct access allowed.');
/**
 * STBlog
 *
 * 基于Codeigniter的单用户多权限开源博客系统
 * 
 *
 * @package		STBLOG
 * @author		Saturn
 * @copyright	Copyright (c) 2009 - 2010, cnsaturn.com.
 * @license		GNU General Public License 2.0
 * @link		http://code.google.com/p/stblog/
 * @since		Version 0.1
 * @filesource
 */
 
// ------------------------------------------------------------------------

/**
 * Script Name: Digg Style Paginator Class
 * Script URI: http://www.mis-algoritmos.com/2007/05/27/digg-style-pagination-class/
 * Description: Class in PHP that allows to use a pagination like a digg or sabrosus style.
 * Script Version: 0.4
 * Author: Victor De la Rocha
 * Author URI: http://www.mis-algoritmos.com
*/

class Dpagination
{
	/*Default values*/
	var $total_pages = -1;//items
	var $limit = null;
	var $target = ""; 
	var $page = 1;
	var $adjacents = 2;
	var $showCounter = false;
	var $className = "pagination";
	var $parameterName = "page";
	var $urlF = false;//urlFriendly

	/*Buttons next and previous*/
	var $nextT = "Next";
	var $nextI = ""; //&#9658;
	var $prevT = "Previous";
	var $prevI = ""; //&#9668;

	/*****/
	var $calculate = false;
	
	#Total items
	function items($value){$this->total_pages = (int) $value;}
	
	#how many items to show per page
	function limit($value){$this->limit = (int) $value;}
	
	#Page to sent the page value
	function target($value){$this->target = $value;}
	
	#Current page
	function currentPage($value){$this->page = (int) $value;}
	
	#How many adjacent pages should be shown on each side of the current page?
	function adjacents($value){$this->adjacents = (int) $value;}
	
	#show counter?
	function showCounter($value=""){$this->showCounter=($value===true)?true:false;}

	#to change the class name of the pagination div
	function changeClass($value=""){$this->className=$value;}

	function nextLabel($value){$this->nextT = $value;}
	function nextIcon($value){$this->nextI = $value;}
	function prevLabel($value){$this->prevT = $value;}
	function prevIcon($value){$this->prevI = $value;}

	#to change the class name of the pagination div
	function parameterName($value=""){$this->parameterName=$value;}

	#to change urlFriendly
	function urlFriendly($value="%"){
			if(eregi('^ *$',$value)){
					$this->urlF=false;
					return false;
				}
			$this->urlF=$value;
		}
	
	var $pagination;

	function pagination(){}
	function show(){
			if(!$this->calculate)
				if($this->calculate())
					echo $this->pagination;
		}
	function getOutput(){
			if(!$this->calculate)
				if($this->calculate())
					return $this->pagination;
		}
	function get_pagenum_link($id){
			if(strpos($this->target,'?')===false)
					if($this->urlF)
							return str_replace($this->urlF,$id,$this->target);
						else
							return "$this->target?$this->parameterName=$id";
				else
					return "$this->target&$this->parameterName=$id";
		}
	
	function calculate(){
			$this->pagination = "";
			$this->calculate == true;
			$error = false;
			if($this->urlF and $this->urlF != '%' and strpos($this->target,$this->urlF)===false){
					//Es necesario especificar el comodin para sustituir
					echo "Especificaste un wildcard para sustituir, pero no existe en el target<br />";
					$error = true;
				}elseif($this->urlF and $this->urlF == '%' and strpos($this->target,$this->urlF)===false){
					echo "Es necesario especificar en el target el comodin % para sustituir el número de página<br />";
					$error = true;
				}

			if($this->total_pages < 0){
					echo "It is necessary to specify the <strong>number of pages</strong> (\$class->items(1000))<br />";
					$error = true;
				}
			if($this->limit == null){
					echo "It is necessary to specify the <strong>limit of items</strong> to show per page (\$class->limit(10))<br />";
					$error = true;
				}
			if($error)return false;
			
			$n = trim($this->nextT.' '.$this->nextI);
			$p = trim($this->prevI.' '.$this->prevT);
			
			/* Setup vars for query. */
			if($this->page) 
				$start = ($this->page - 1) * $this->limit;             //first item to display on this page
			else
				$start = 0;                                //if no page var is given, set start to 0
		
			/* Setup page vars for display. */
			$prev = $this->page - 1;                            //previous page is page - 1
			$next = $this->page + 1;                            //next page is page + 1
			$lastpage = ceil($this->total_pages/$this->limit);        //lastpage is = total pages / items per page, rounded up.
			$lpm1 = $lastpage - 1;                        //last page minus 1
			
			/* 
				Now we apply our rules and draw the pagination object. 
				We're actually saving the code to a variable in case we want to draw it more than once.
			*/
			
			if($lastpage > 1){
					if($this->page){
							//anterior button
							if($this->page > 1)
									$this->pagination .= "<a href=\"".$this->get_pagenum_link($prev)."\" class=\"page-start\"><span>$p</span></a>";
								else
									$this->pagination .= "<span class=\"page-start\"><span>$p</span></span>";
						}
					//pages	
					if ($lastpage < 7 + ($this->adjacents * 2)){//not enough pages to bother breaking it up
							for ($counter = 1; $counter <= $lastpage; $counter++){
									if ($counter == $this->page)
											$this->pagination .= "<span class=\"page-cur\">$counter</span>";
										else
											$this->pagination .= "<a href=\"".$this->get_pagenum_link($counter)."\">$counter</a>";
								}
						}
					elseif($lastpage > 5 + ($this->adjacents * 2)){//enough pages to hide some
							//close to beginning; only hide later pages
							if($this->page < 1 + ($this->adjacents * 2)){
									for ($counter = 1; $counter < 4 + ($this->adjacents * 2); $counter++){
											if ($counter == $this->page)
											$this->pagination .= "<span class=\"page-cur\">$counter</span>";
										else
											$this->pagination .= "<a href=\"".$this->get_pagenum_link($counter)."\">$counter</a>";
										}
									$this->pagination .= "...";
									$this->pagination .= "<a href=\"".$this->get_pagenum_link($lpm1)."\">$lpm1</a>";
									$this->pagination .= "<a href=\"".$this->get_pagenum_link($lastpage)."\">$lastpage</a>";
								}
							//in middle; hide some front and some back
							elseif($lastpage - ($this->adjacents * 2) > $this->page && $this->page > ($this->adjacents * 2)){
									$this->pagination .= "<a href=\"".$this->get_pagenum_link(1)."\">1</a>";
									$this->pagination .= "<a href=\"".$this->get_pagenum_link(2)."\">2</a>";
									$this->pagination .= "...";
									for ($counter = $this->page - $this->adjacents; $counter <= $this->page + $this->adjacents; $counter++)
										if ($counter == $this->page)
											$this->pagination .= "<span class=\"page-cur\">$counter</span>";
										else
											$this->pagination .= "<a href=\"".$this->get_pagenum_link($counter)."\">$counter</a>";
									$this->pagination .= "...";
									$this->pagination .= "<a href=\"".$this->get_pagenum_link($lpm1)."\">$lpm1</a>";
									$this->pagination .= "<a href=\"".$this->get_pagenum_link($lastpage)."\">$lastpage</a>";
								}
							//close to end; only hide early pages
							else{
									$this->pagination .= "<a href=\"".$this->get_pagenum_link(1)."\">1</a>";
									$this->pagination .= "<a href=\"".$this->get_pagenum_link(2)."\">2</a>";
									$this->pagination .= "...";
									for ($counter = $lastpage - (2 + ($this->adjacents * 2)); $counter <= $lastpage; $counter++)
										if ($counter == $this->page)
												$this->pagination .= "<span class=\"current\">$counter</span>";
											else
												$this->pagination .= "<a href=\"".$this->get_pagenum_link($counter)."\">$counter</a>";
								}
						}
					if($this->page){
							//siguiente button
							if ($this->page < $counter - 1)
									$this->pagination .= "<a href=\"".$this->get_pagenum_link($next)."\" class=\"page-next\"><span>$n</span></a>";
								else
									$this->pagination .= "<span class=\"page-next\"><span>$n</span></span>";
								if($this->showCounter)$this->pagination .= "<div class=\"pagination_data\">($this->total_pages Pages)</div>";
						}
				}

			return true;
		}
}
	
/* End of file Dpagination.php */
/* Location: ./application/libraries/Dpagination.php */